# Copyright (c) 2007 Chris Moyer http://coredumped.org
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish, dis-
# tribute, sublicense, and/or sell copies of the Software, and to permit
# persons to whom the Software is furnished to do so, subject to the fol-
# lowing conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-
# ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
# SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
# IN THE SOFTWARE.

import os
import re


class RRD:
	"""
	This is a very simple class to wrap the options of RRDtool
	into a class.
	"""
	def __init__(self, filename):
		self.filename = filename

	def create(self, sources, archives, start="now", step=None):
		opts = ""
		if(step):
			opts = opts + " --step " + str(step)
		if(start):
			opts = opts + " --start " + str(start)

		for ds in sources:
			opts = opts + " " + ds.to_string()

		for rra in archives:
			opts = opts + " " + rra.to_string()

		return os.system("rrdtool create " + self.filename + " " + opts)

	def info(self):
		f = os.popen("rrdtool info " + self.filename)
		lines = f.read()
		lines = lines.split("\n")
		info = {}

		for line in lines:
			try:
				key, value = line.split("=")
				info[key.strip()] = value.strip().replace("\"", "")
			except:
				continue
		return info

	def last_ds(self):
		info = self.info()
		ds = {}
		for k in info:
			v = info[k]
			match = re.match("^ds\[(.+?)\]\.last_ds$", k)
			if(match):
				ds[match.group(1)] = v
		return ds
